S
M
T
W
T
F
S
26
93°
63°
27
97°
65°
28
102°
65°
29
102°
67°
30
93°
69°
1
97°
68°
2
95°
62°
3
93°
62°
4
89°
63°
5
91°
64°
6
94°
69°
7
94°
66°
8
97°
65°
9
96°
68°
10
94°
70°
11
100°
75°
12
97°
74°
13
95°
71°
14
94°
69°
15
95°
69°
16
96°
70°
17
87°
65°
18
89°
66°
19
89°
67°
20
88°
70°
21
90°
71°
22
89°
71°
23
89°
70°
24
88°
71°
25
86°
69°
26
87°
70°
27
87°
69°
28
88°
68°
29
88°
69°
30
89°
68°
31
90°
69°
1
91°
70°
2
90°
74°
3
91°
74°
4
91°
72°
5
90°
70°
6
91°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Costa Rica
Costa Rica's May 2026 forecast shows daily high temperatures ranging from 86° to 100°, with overnight lows between 63° and 75°. The average high for May is 91° with an average low of 69°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Costa Rica. See also: June | July | August.
